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Baked sweet potato casserole with toasted marshmallows in a white ceramic dish

Old-School Southern Marshmallow Sweet Potato Casserole (Grandma’s Recipe)

This classic Southern Marshmallow Sweet Potato Casserole turns simple sweet potatoes into a rich, velvety, spiced masterpiece topped with a perfectly toasted, gooey marshmallow crust.
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Course: Side Dish
Cuisine: American
Keyword: easy, marshmallow, old fashioned, sweet potatoes, yams
Prep Time: 40 minutes
Cook Time: 45 minutes
Total Time: 1 hour 25 minutes
Servings: 12 servings
Calories: 308kcal
Cost: $8.00

Equipment

Ingredients 

  • 4 lbs sweet potatoes (about 5 large), peeled and cut into 1-inch pieces
  • 1 cup milk
  • 6 Tbsps butter, softened
  • ½ cup packed brown sugar
  • 1 large egg
  • 1 ½ tsp ground cinnamon
  • ¾ tsp ground allspice
  • 1 ½ tsp vanilla extract
  • ½ tsp salt
  • ¼ tsp ground nutmeg
  • 10 large marshmallows, cut in half lengthwise

Instructions

  • Preheat the oven to 350°
  • Place the sweet potatoes in a 6-quart stockpot, and add water to cover the potatoes.
  • Bring to a boil, reduced the heat. Cook uncovered until the potatoes are tender for about 15 to 20 minutes.
  • Drain the potatoes, and place them in a large bowl.
  • Beat the potatoes, till smooth. Add the next 9 ingredients, which would be all but the marshmallows. Beat until blended.
  • spread this mixture into a greased shallow 2 ½ quart baking dish.
  • Bake, uncovered, until heated all the way through, about 40 to 45 minutes. Increase the oven setting to 425°.
  • top the casserole with marshmallows. Bake until marshmallows are lightly browned, about 3 to 4 minutes longer.

Notes

Light brown sugar has a delicate flavor, while dark brown sugar has a stronger molasses flavor. Grandma always said to just use them interchangeably as you'd like.  

Nutrition

Nutrition Facts
Old-School Southern Marshmallow Sweet Potato Casserole (Grandma’s Recipe)
Serving Size
 
1 cup
Amount per Serving
Calories
308
% Daily Value*
Fat
 
6
g
9
%
Saturated Fat
 
3
g
19
%
Cholesterol
 
33
mg
11
%
Sodium
 
198
mg
9
%
Carbohydrates
 
58
g
19
%
Fiber
 
3
g
13
%
Sugar
 
34
g
38
%
Protein
 
4
g
8
%
* Percent Daily Values are based on a 2000 calorie diet.
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